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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '494887f71e4427ad03639b6bbe0f30ab13f6bc0fddb8a8f06653ecef43fc9b90' 
  AND token = '8LyMhKlB0mUrSev/omQvplKnCkkVWB9Wa1zyt/aQrbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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