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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '044ebd071d3e5c62fb3a47e66e22cfd8f75af37a2c290d79da2baa9fbfa6c6bf' 
  AND token = 'wQU3c6sjVi79pms1H/OulICc+6r9ZrYj2qvYDWje768=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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