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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c41c7df2f322bde5723fa3cbbc60e55b1c5f639702d097eed65fd96a2cff644' 
  AND token = 'cq7vlmup8VZIpKjREqeOP1v4PfP0FBwsyeUdLAF62UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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