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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2b9be0b96696096c30065c618723701a6cea9cd066587a3fe8eb4bcf2b00e26' 
  AND token = 'wVRAVJD4Xa2HV2eVii2RFtSOcFME1r7JBRLAOmxE4/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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