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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0549dc7b25389ae4808cf8e2e6ea7de24113ed0554e66ef6426e9f19403788d2' 
  AND token = 'aTK0rdFvRyObgOdYfB0Mvk1ik/T9ZoegLCaIpmaQXbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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