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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '488dc6b5e0885963ef016e9ff75244f36592a373940deee6738d54083fcd720b' 
  AND token = 'QXhi80iABcP72vb+iARPHiJPMDkhSWUOvDXNrNGVUy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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