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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd382b3e48a59ffd4d49af9bfaf06638da4ee5347ea215f18da4ad9ded1d6dc6a' 
  AND token = '2N0V0k7jwR41bsqn3LSFfxsdfuCXadn8f+Xc3gIzBdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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