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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b786689f857da1add1bda335e16453d707e7a29beaa079dd0c4741fbe3a430ab' 
  AND token = 'sDybtiN+yxu1NT8C2GzRfJUfg6n2SadC2/YPWPnMsm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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