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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c6190220fdfa6f0539d98ab110b6a8f0e7b993e34506a52383650c0aa6b6de8' 
  AND token = 'XiZl1nfGYwPwJ+EYkes0xpb0zJOkInd9SAujmBcj4M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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