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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93d94f0d5ea7dcad4095ae0821d93a653d6396fc781e64cc61cb0bf70f3d4970' 
  AND token = 'ZZ93OroeXYtQT2+3Wab+HMvoRFV+WX8r0/uyaRlD69U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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