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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '758028f12bb553dccd697262ee50166285a8db17071693e6ba088f13f1157b76' 
  AND token = 'YyQIwb0jL5ruwoOwB+R/W0EceH/amaTIrHyNsd0ZFnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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