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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1c85a40f7824797b824f140282ab50c7fd45a2b3121720382fe534d36fdfa94' 
  AND token = 'z/54Rkjzz4qQhzkD0APar+JT/3fuk5B4Qd9YjqnLa9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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