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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d4f5ce7242f70bee1c6ffc0acd0c1afd4cf137d27fd9854fa1958b1896abdb0' 
  AND token = 'oaYD7wdKZ8n5By9WCxkXg9r6t+Z1h5tf9SnmekxvCL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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