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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28b31548d4d3bd07959f6b37a5d611401a150b5347608a1737b5e27c15fd4a12' 
  AND token = 'aqJCdA1kVLNFOY9PHj2X2cOoUsRKBxisy26Bxcc6KfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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