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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '603dd696201f3e1ae412c6f7d1ea4589236e9ae87c4982996ca69e8a22c64c82' 
  AND token = 'UjQmivK+p48Ui4G4xVw2mQPOJ62FR9WJQHBF8wrIiVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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