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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'adbb8dd00758dff9923ba5efb92e9d366b9ea61bbb0719738b5b3845c3af7c3e' 
  AND token = 'OzzrpLNEt9x8vWO+k2aHaUmQH4TTnTi4iljaW1yaMs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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