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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa9afebf3d6b9faba90ab26af2db24210fa2113fbfdc54e61f62ec8fcdf869ec' 
  AND token = 'ewtAC9tw9rNDepXARczgzKih/MCPLXa/pX6AuKdN20o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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