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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '688a436ec59674dc4c173296787d590438d668e053e0de6a56aa8bd4f8e0305a' 
  AND token = 'v6SYtIRB6zusn4wkZ3R5Iq7srhRSF/ZDiOxOYWXFWrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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