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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28bc2b0be15082bc8661918a44b2a56760c5150ba35faa525e8e9279e7d2a690' 
  AND token = 'BFPN+ZuvplaRqLnukZx98AeELpP6Li4u8zx2KtW7pJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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