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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2ffc878d52effae4ad20667b9c0e6383b23e88852023064c8680349eeb3fb48' 
  AND token = 'IY5apK7r8pRP9k0prSCL5aoiE3X7kDmSCPFT9y4aiuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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