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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a2e32402e9d999e27143c0f6248ab48afcc7220ced363f3907427517f9345ef' 
  AND token = 'kJuu39UP78MkHobf6BY6xd3USOS8MUP7GQY3YuVA35A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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