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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '045c531667294a1032b8062bc2bade021587bfa77e7a7929af77a424802090bb' 
  AND token = 'T/0R3KLlqsTSMFutDVS4OMSVLE7XPrc5TvGoBIsQaL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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