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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec22681ce4852fed14bf26fe74c6153e2d1b49590d10a8b209524b14368e933a' 
  AND token = 'Tk2l56yXUU1T9ltAeeDNw99FI9RB0KxP7zACKALzp4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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