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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f974a4ecc2282c2f0099f720e293a08dde288170c6a34b1158e70f7a193e4031' 
  AND token = '+1vKvepSIrOUPdwZnInXHOzi5ClEgEznN+IcuMMS1Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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