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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f49b66260090a88f0aa6add2b6d23be08c05bd522cb738c5b65a404362d0ed5' 
  AND token = 'h71kHVaCkXVOKqKInSD+ypG0e0cyDxtFypAByH11vOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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