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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45659f0e657808c366d9ea401badfb4d7435c1077f1e0586cf0d9456f6bd53c8' 
  AND token = 'yE3AIJ0sNv+1PvGNy4q5XpwbOl6nRYJK1ZLPKycKHwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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