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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '360ddd1aaf265dc0b1e4108f84a552dff8b78a79874ec6a02fcab93b6ba1640e' 
  AND token = 'boImOMPdNOH5zPylE0J1ttxFRxN3rvPsfLqjcMF+RwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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