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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2ef273e344dddac1df7fb67b54deaec9db97fe1581d9a105f0999a52eccaf37' 
  AND token = 'Zd9uJ87AzfcmE43NaYoZOd6nAYw12HyyQPjbccL+D8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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