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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '401da0520cf8e0f370fc9d9e2debbb0348a075bba90414fee0ef9b5690ff12f6' 
  AND token = 'GL1xBCQCOZUCQ3Vwb4Le29zcwbHs76oEuSj08bYcqJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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