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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '345e4df30995de2f184c266c47bdbe4ad6b30cc9515ddc0be5866df61ebc444d' 
  AND token = 'ttXXzQAxfY0ueBmNIIpatjOnFD4UFVVvOB3pThVAvBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}