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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cca7679fec1d9448f67620c861e5d0fad90aa091602650c368bb14629fcd90c' 
  AND token = '/kISIeqhLxOldRpdjSSJUKiE+hiqv9ebU5x6cBg5gRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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