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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e8189d440b43767f2a17a496ce3a79909920b20c5a753bc6c8eef04d1bf5f95' 
  AND token = 'zFf1TpUmfiOks6Jxx+Af9hEAvrpu2LfFfVaRbyY1pSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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