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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a76252e4c9ccbe713f540f8a10d7f9a42d389a63b2e8993b41fc981d643a01b' 
  AND token = 'KDD6Iz8c216MY4YPw70C611Ci+NUUlTgp23g61E7BbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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