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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da919660440532e87aee3f49e4d1b602148d36a3b35111018bb48d6e3203e175' 
  AND token = '3WbuZrOB3InZHz6OZ7E0mHYfpjR3NOf9ieqeKQDnxys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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