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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6b3d464b72e8838dbf57f6914f29bd89c4e4906808b793e93b4ff45b6d7209c' 
  AND token = 'F5SnKNFuDMLAuiWjjUQ6P6N81CtugMSr0Bh67Ei1KdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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