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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c6d5120909d995a6e014cce99dfc6507a6345b99be8aa9b1526e4aad3806e69' 
  AND token = '7ktLG2fR3XYfmONv8dlGCliVQudkCQYALuJK5K4pRnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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