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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea0e276089fe284dc4667e7b4fb39f3573845c453ac542366841841b251b7e2b' 
  AND token = 'DGCZy62rCJUB/Qm2OB4+etlWvbJJfitW+Chxotcei58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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