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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88115d290c6eb78397f46ab96966e367cc22b380335f4b531e3710cc35626c6d' 
  AND token = 'JbD8U7CKuhQd1DAxxkgnxf1cgPX13DZZVHIulvAeCsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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