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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8d1a53f20feddffc555fb6c5f20912433923ef67e25f9fc302b9c039658c179' 
  AND token = 'c4dUZxpAZUKVkX6GOyqnEL4esGyBNotNdt+lVjboDw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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