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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '305c8a165486251b6fa0d54ea866488af4c242fc7649f82d8c1b3d50dbf8659f' 
  AND token = 'oRe9owfWpB1EeRDMysB21uC4ASV73FUZO/NcNZHl3aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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