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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e8a9f38aa7de33517a39fed35ececd3987befd56d351c086b96c6321cf380db' 
  AND token = 'XKf8Ce+3mdJmVivrwcbB9frBGhY+ZO0wVPxtRTakq5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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