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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '441a2908edebcc0573106de9e462e2616adec51901f2904c7fe89e8a7bd79694' 
  AND token = '53aHL579O052U3wehVgLc5HcPzKOKovwMKKHqehoWEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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